Open Source Web Development with LAMP: Using Linux, Apache, MySQL, Perl, and PHP

12.6. Built-In PHP Functions

PHP has a number of built-in functions. We sample a few, but there is no way we can cover all of them in this overview. See the documents (www.php.net/manual/en/funcref.php) or a suggested book for a complete list.

12.6.1. Important Functions

Let’s start with two important functions: print() and die().

print()

This function outputs a string that ends up being displayed in the browser. For example:

print "<h1>PHP Results</h1>"; 
print "$name : $age : $result[0]"; 
print "<hr>"; 

The print() function is essentially the same as the echo statement. These two do the same thing—they both produce the text “hello, world!”:

echo "hello, world!"; 
print "hello, world!"; 

die()

PHP also has the die() function, which outputs ...